<?php
/**
功 能：文件上传类 支持文件夹自动分组保存;
创建类：参数(文件域,文件原名,文件大小);
$myupload = new upfileClass($upfile,$upfile_name,$upfile_size);
$myupload->savefile(); # 保存方法 并返回保存路径附带文件名;

@ echo MakeBuild($BuildFile,$newFile,$File_width);
生成指定文件的缩略图;
$myupload->MakeBuild("images/a.jpg","news/b.jpg","100");
 */

class upfileClass
{
    var $upfile, $upfile_name, $upfile_size;

    var $new_upfile_name;   # 上传后的文件名称 ;
    var $fleth, $fileExtent; # 文件扩展名(类型) ;
    var $f1, $f2, $f3;   # 文件保存路径(多级) upfiles/2008-01/08/;
    var $filename;    # 文件(带路径) ;

    var $maxSize, $File_type; # 允许上传文件的大小 允许上传文件的类型 ;

    var $BuildFile,$newFile,$File_width,$File_height,$rate;

    function upfileClass($upfile,$upfile_name,$upfile_size)
    {
        $this->upfile = $upfile;
        $this->upfile_name = $upfile_name;
        $this->upfile_size = $upfile_size;

        $this->new_upfile_name = $this->CreateNewFilename($this->upfile_name);

        $this->f1 = "upfiles";
        $this->f2 = $this->f1."/".date('Y')."-".date('m');
        $this->f3 = $this->f2."/".date('d');

        $this->filename = $this->f3 . "/" . $this->new_upfile_name;
        $this->maxSize = 500*1024;    # 文件大小 500KB
        $this->File_type = "gif/jpg/jpeg/png"; # 允许上传的文件类型
    }

# 创建新文件名 (原文件名)
    function CreateNewFilename($file_name)
    {
        $this->fleth = explode(".",$file_name);
        $this->fileExtent = $this->fleth[(int)count($this->fleth)-1]; # 获取文件后缀;
        $tmpstr = date('YmdHis') . "." .$this->fileExtent;    # 创建新文件名;
        return $tmpstr;
    }

# 检测文件类型是否正确
    function chk_fileExtent()
    {
        $iwTrue = 0;
        $fle = explode("/",$this->File_type);
        for($i=0; $i < count($fle); $i++){
            if( $this->fileExtent == $fle[$i] )
            {
                $iwTrue = (int) $iwTrue + 1;
            }
        }
        if( $iwTrue == 0 ){
            $this->msg("文件不符合 ".$this->File_type." 格式!");
        }
    }

# 提示错误信息并终止操作
    function msg($Error)
    {
        echo "<script language=/"javascript/">/n";
   echo " alert('".$Error."');/n";
   echo " window.history.back();/n";
   echo "</script>/n";
   die();
}

# 保存文件
    function savefile()
    {
        $this->chk_fileExtent();
        $this->chk_fileSize();
        $this->CreateFolder( "../".$this->f1 );
        $this->CreateFolder( "../".$this->f2 );
        $this->CreateFolder( "../".$this->f3 );
        return $this->chk_savefile();
    }

# 检测上传结果是否成功
    function chk_savefile()
    {
        $copymsg = copy($this->upfile,"../".$this->filename);
        if( $copymsg ){
            return $this->filename;
        }
        else{
            $this->msg("文件上传失败! /n/n请重新上传! ");
        }
    }

# 创建文件夹
    function CreateFolder($foldername)
    {
        if( !is_dir($foldername) ){
            mkdir($foldername,0777);
        }
    }

# 检测文件大小
    function chk_fileSize()
    {
        if( $this->upfile_size > $this->maxSize ){
            $this->msg("目标文件不能大于". $this->maxSize/1024 ." KB");
        }
    }

# 删除文件($filePath 文件相对路径)
    function Deletefile($filePath)
    {
        if( !is_file($filePath) ){
            return false;
        }
        else{
            $ending = @unlink($filePath);
            return $ending;
        }
    }

    /*
       函数：生成缩略图
        MakeBuild("images/a.jpg","news/b.jpg","100");
       参数：
       echo $BuildFile;   原图 带路径
       echo $newFile;    生成的缩略图 带路径
       echo $File_width;   缩略图宽度值
       echo $File_height;   缩略图高度值 (默认为宽度的比例值)
       echo $rate;     缩略图象品质;
    */
    function MakeBuild($BuildFile,$newFile,$File_width,$File_height=0,$rate=100)
    {
        if(!is_file($BuildFile)){
            $this->msg("文件 ".$BuildFile." 不是一个有效的图形文件！/n/n系统无法生成该文件的缩略图！");
            return false;
        }
        $data = GetImageSize($BuildFile);
        switch($data[2]){
            case 1:
                $im = @ImageCreateFromGIF($BuildFile);
                break;
            case 2:
                $im = @ImageCreateFromJPEG($BuildFile);
                break;
            case 3:
                $im = @ImageCreateFromPNG($BuildFile);
                break;
        }
        if(!$im){
            return false;
        }
        else{
            $srcW=ImageSX($im);  # 取得原图宽度;
            $srcH=ImageSY($im); # 取得原图高度;
            $dstX=0;
            $dstY=0;

            if($File_height==0){
                $File_height = $File_width/$srcW*$srcH;
            }

            if ($srcW*$File_height>$srcH*$File_width){
                $fFile_height = round($srcH*$File_width/$srcW);
                $dstY = floor(($File_height-$fFile_height)/2);
                $fFile_width = $File_width;
            }
            else {
                $fFile_width = round($srcW*$File_height/$srcH);
                $dstX = floor(($File_width-$fFile_width)/2);
                $fFile_height = $File_height;
            }
            $ni = ImageCreateTrueColor($File_width,$File_height);
            $dstX = ($dstX<0)?0:$dstX;
            $dstY = ($dstX<0)?0:$dstY;
            $dstX = ($dstX>($File_width/2))?floor($File_width/2):$dstX;
            $dstY = ($dstY>($File_height/2))?floor($File_height/s):$dstY;
            ImageCopyResized($ni,$im,$dstX,$dstY,0,0,$fFile_width,$fFile_height,$srcW,$srcH);

            ImageJpeg($ni,$newFile,$rate); # 生成缩略图;
            imagedestroy($im);     # imagedestroy(resource) 释放image关联的内存
        }
    }

}
?>